These are clear rigid plastic sleeves that fit a standard size postcard. They are 5.75 x 3.625 and open on the long end. 100 % non migrating Vinyl. Durable 16 mil PVC with 40 mil Opening. These sleeves protect your collectible postcards and enhance their value. There is no charge for shipping in the USA. Canada or overseas enquire for rate to dennis@coolpostcards.com